采用概率法计算生活排水管道设计秒流量

Calculation of Design Flow in Domestic Sewer by Probability Method

提出采用概率法计算生活排水管道设计秒流量。把水流在管道内的行为模拟为绳子下落或火车行驶,论述了卫生器具的排水概率的计算方法。运用泊松分布模型计算排水设计秒流量,分别采用积分计算和正态分布逼近来构建设计秒流量的计算公式。分析了保证率、卫生器具使用频率、水流实际形态等因素对排水设计秒流量的影响。对概率法、《建筑给水排水设计规范》中的平方根法、美日概率法进行了对比分析,结果表明,采用概率法计算生活排水设计秒流量科学、准确、简洁且便于使用。

A probability method for calculation of design flow of domestic sewer was introduced. The behavior of sewage flow in the sewer was modeled as a falling rope or a running train. The calculation method for the drainage probability of plumbing fixture was discussed. The drainage design flow was cal- culated using the Poisson distribution model, and the calculation formula of design flow was created by the integral calculation and the normal distribution approach. Factors affecting the design flow, including guarantee rate, usage frequency of fixture, the actual flow morphology and others were analyzed. It is concluded that the proposed probability method is scientific, accurate, simple and feasible after comparative analysis with the square-root method from the Code for Design of Building Water Supply and Drainage and the probability method used in the US and Japan.